PIC12F1822-ISLASHMF datasheet(138/398 Pages) MICROCHIP

138 / 398 page

PIC12F/LF1822/16F/LF1823

DS41413A-page 138

Preliminary

 2010 Microchip Technology Inc.

15.2.6

A/D CONVERSION PROCEDURE

This is an example procedure for using the ADC to

perform an Analog-to-Digital conversion:

Configure Port:

• Disable pin output driver (Refer to the TRIS

• Configure pin as analog (Refer to the ANSEL

Configure the ADC module:

• Select ADC conversion clock

• Configure voltage reference

• Select ADC input channel

• Turn on ADC module

Configure ADC interrupt (optional):

• Clear ADC interrupt flag

• Enable ADC interrupt

• Enable peripheral interrupt

• Enable global interrupt(1)

Wait the required acquisition time(2).

Start conversion by setting the GO/DONE bit.

Wait for ADC conversion to complete by one of

the following:

• Polling the GO/DONE bit

• Waiting for the ADC interrupt (interrupts

enabled)

Read ADC Result.

Clear the ADC interrupt flag (required if interrupt

is enabled).

EXAMPLE 15-1:

A/D CONVERSION

Note 1: The global interrupt can be disabled if the

user is attempting to wake-up from Sleep

and resume in-line code execution.

2: Refer to Section 15.3 “A/D Acquisition

Requirements”.

;This code block configures the ADC

;for polling, Vdd and Vss references, Frc

;clock and AN0 input.

;

;Conversion start & polling for completion

; are included.

;

BANKSEL

ADCON1

;

MOVLW

B’11110000’ ;Right justify, Frc

;clock

MOVWF

ADCON1

;Vdd and Vss Vref

BANKSEL

TRISA

;

BSF

TRISA,0

;Set RA0 to input

BANKSEL

ANSEL

;

BSF

ANSEL,0

;Set RA0 to analog

BANKSEL

ADCON0

;

MOVLW

B’00000001’ ;Select channel AN0

MOVWF

ADCON0

;Turn ADC On

CALL

SampleTime

;Acquisiton delay

BSF

ADCON0,ADGO ;Start conversion

BTFSC

ADCON0,ADGO ;Is conversion done?

GOTO

$-1

;No, test again

BANKSEL

ADRESH

;

MOVF

ADRESH,W

;Read upper 2 bits

MOVWF

RESULTHI

;store in GPR space

BANKSEL

ADRESL

;

MOVF

ADRESL,W

;Read lower 8 bits

MOVWF

RESULTLO

;Store in GPR space

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